On Tue, Oct 07, 2014 at 05:21:49PM +0200, Michal Hocko wrote:
> On Wed 24-09-14 11:43:09, Johannes Weiner wrote:
> > Abandon the spinlock-protected byte counters in favor of the unlocked
> > page counters in the hugetlb controller as well.
> >
> > Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
>
> One minor thing below:
> Acked-by: Michal Hocko <mhocko@xxxxxxx>
Thank you!
> > static ssize_t hugetlb_cgroup_write(struct kernfs_open_file *of,
> > char *buf, size_t nbytes, loff_t off)
> > {
> > - int idx, name, ret;
> > - unsigned long long val;
> > + int ret, idx;
> > + unsigned long nr_pages;
> > struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of));
> >
> > + if (hugetlb_cgroup_is_root(h_cg)) /* Can't set limit on root */
> > + return -EINVAL;
> > +
> > buf = strstrip(buf);
> > + ret = page_counter_memparse(buf, &nr_pages);
> > + if (ret)
> > + return ret;
> > +
> > idx = MEMFILE_IDX(of_cft(of)->private);
> > - name = MEMFILE_ATTR(of_cft(of)->private);
> >
> > - switch (name) {
> > + switch (MEMFILE_ATTR(of_cft(of)->private)) {
> > case RES_LIMIT:
> > - if (hugetlb_cgroup_is_root(h_cg)) {
> > - /* Can't set limit on root */
> > - ret = -EINVAL;
> > - break;
> > - }
> > - /* This function does all necessary parse...reuse it */
> > - ret = res_counter_memparse_write_strategy(buf, &val);
> > - if (ret)
> > - break;
> > - val = ALIGN(val, 1ULL << huge_page_shift(&hstates[idx]));
> > - ret = res_counter_set_limit(&h_cg->hugepage[idx], val);
> > + nr_pages = ALIGN(nr_pages, 1UL<<huge_page_order(&hstates[idx]));
>
> memcg doesn't round up to the next page so I guess we do not have to do
> it here as well.
That rounding was introduced very recently and for no good reason
except that "memcg rounds up too". Meh. I'll remove it.
Thanks!
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